Solved bu waiting for 16 hours and try again... My guess is, that their servers were too busy.
My colleague was invited by me to Trello. He accepted the invite and became a member of Atlassian Trello. He can log in fine via browser but we can't add it to his Microsoft teams on a windows computer. Either the login window is completely blank og it gives a message saying "Request is broken". Anyone having the same problem and figured out how to solve it. The office is going crazy here, as we cannot solve it ourselves :-)
